Hexbyte Hacker News Computers Polar is a Personal Knowledge Repository for Windows, Mac, and Linux.

Hexbyte Hacker News Computers

Hexbyte Hacker News Computers

A powerful offline browser for Mac, Windows, and Linux for
managing all your web content, books, and notes. Polar keeps all
your content in one place, supports tagging,
annotation, highlighting and keeps track of your
reading progress.

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allows you to keep all your documents, annotations, and flashcards in
one place
. Never lose track of what you’re reading again.
Annotate documents directly while reading them and sync with
spaced repetition systems like Anki.

PDF support

We have first-class PDF support thanks to PDF.js. PDFs work well when reading content in book format or when reading scientific
research which is often stored as PDF.

Captured Web Pages

Download HTML content and save them as offline documents which can be annotated.


Easily keep track of what you’re reading and the progress of each
document. Pagemarks enable non-linear reading and the ability to
suspend and resume individual documents for later consumption.


All content is stored locally. You can also use a system like
git or Dropbox to transfer your repository
across machines.


The entire system is based on Electron,
Node, pdf.js, React and other
web standards. If you’re a developer – welcome home!

Standards Based

All content is stored as JSON in a well documented schema.
Annotations never change the original content which keeps your
document repository safe.

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Annotations are a central feature to POLAR. While reading documents
you can underline text or create area highlights. Once created, you
can attach additional metadata to annotations such as comments and

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Hexbyte Hacker News Computers Document Repository

The document repository allows you to manage your documents in one
– sort by reading progress, or time added, archive and filter
flagged documents.

Documents can be opened by double clicking them to open a new window.

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Filter documents by tag

Hexbyte Hacker News Computers Web Content

Polar supports reading and annotating HTML documents. We
call this process ‘capturing’ content and we store the document
permanently in your own private archive.

Since most
pages aren’t designed for reading and have ads, chrome, and other
annoyances within the page, we render the content as a tablet
to make the content more readable.

Browser emulation

Emulate multiple browsers and mobile content to make sure
pages captured are rendered properly.

Personal Archive

All content is stored in a personal archive which allows you
to refer back to important documents and view annotations
over time.

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All annotations are easily accessible in the sidebar. You can create
flashcards, add comments, and jump to any text highlight in the main
document at any time.

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We update


every couple of


with new features and
listen to your feedback on our


. Jump
on our


or suggest a feature in Github and there’s a good chance it will be

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